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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07e4758c2a639d5cc1e8929906cbc730203aee5e82cd22eabcd20a7efcc7f5e' 
  AND token = 'vRnewy89nZuw35704v0Tp6ypNnS6l+DivLrWeVEknHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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