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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac6cc90b655b1e687a614f0b5e40f033f2abb09919ea447fdf542b52104fd84' 
  AND token = 'MC5ymQ5M2db28GKZhN4QUuC4S32iB1lfbskDKDpTDoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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