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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5736110e201cd3c67acf7b29e4fff088b79938eb5296517ee7d72c00a015187e' 
  AND token = 'QdcKt/2bt4U2Uv0UmTCu/TDWfRaK8kDtTYFQCimsUvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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