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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c425e1d2aa95b988a5958f3fb82adffc183634d71e1872ed173542cc946b0df3' 
  AND token = 'lzkmLwCnSX7Eq4eko5wtooHPa67UxkCpJ0ATe6esmLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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