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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfc8cd47fbc6bb32d1f238c7a7fc6e75d6057028df984e598f793d86f6f7175' 
  AND token = 'K8HBqk9Z+AZInd2ewi8mCRD1x+NQXRH2Su+npe7M3Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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