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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa723488dde5359eeba1095baac32bcecbe708f68d4c19c703ea854e91eabc6e' 
  AND token = '9zcpMHoXb1luc3IRz0aVbaITvSc7sLowYaEyDrt9AO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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