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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662ca7f95342f65e02b35a317cafe31124625097b1374998d9a5a45d292def80' 
  AND token = 'W1jkkIySCY6UBD8aXOJ11ro9gQ4XO4GDd7AXlXIVeew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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