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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc625b9e3fc841803d0c3665958b237f660ce68e12a8dfa77b79e707025bf87' 
  AND token = 'B2GJ0h8U1lfpkJbw2skHF/dHd2fcUS5SYR6EeMeJ7hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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