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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd486e2398390e6570e4ccda7d0619c246775390f587cec84cc8f1a8d116f0b4' 
  AND token = 'CWLPpsMBj17Gq6PoHeTLCDl2cVOj9QacAZMyUdx5oGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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