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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf22fa60005c58e6fd117ba5041675372d66fe2297acd3555b11601c2c8deef9' 
  AND token = '7bJwLcq2MgMUKlOYBPaNwFWAoiC0+zfnls9nbMN/7Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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