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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198d4ce2a28a53491c0b5967a868906948a4b9b5c3b37229c4a0d36248f88b1e' 
  AND token = 'aqB1Rir3nJxH4VDNk1FDUog7DQhonqx2dcGb5n387a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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