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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2476ec7663e416273bb2d324889d283a3c1c83e3dc991d59341ac4e53926af6a' 
  AND token = 'q7lGojiTpOdGvWp5vfDQ74gjWBgY5cFs1A++WYH74PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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