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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f0f1014fb9e35d56bc3e011b6eb5629d36877fab6a7ebf21e2337f5431fe01' 
  AND token = 'ZnnxCXaHXzcx0chO7Oku16anPR6h7fbzuwF/bckNOo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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