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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd970befe4a8c602eaaec4c6356eae4a727794e6e9e0c7772e20650f46fe1ecf5' 
  AND token = 'QSLB2I20kPo0wonez/Ov13zzA00kZMIxS3ikCCEjW8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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