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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638ee6fdd41f568352fac9f9fb3ebc4041e425b39336d98cabf3ef7ac66ad07a' 
  AND token = '61f+4hvICsYD1E8f+Nxe/HWynaFaoy1bWZFKxBxRpzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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