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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241baea7f2b039617a58d5dc82024a7e76f3a077aecb3084e928dd77d2472554' 
  AND token = 'YcoqUIqxp0F53s6sWx3jr919U7uewUzk9qJ5mlTdVJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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