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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab77d5486bdf7d06be800264fe8a1fb05753fce2d452d6b9834d5a7d8dcb6a1' 
  AND token = 'lsK5RcGHTROEX2gQ4BAH7/n0pivfj7sdFYZqonOptl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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