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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a778d2f5287ae0f53a4649959e66b4bae55dcda344cd0b75036a084e0978e67' 
  AND token = 'X6km5VVPObx4xGv9OU56FEGtl/wUJF1KJI1N5QjNyxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}