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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8342af396978a8ce93bedf5a9130b54bccdbf1fd81f7d77c97db2e6171a1d8f0' 
  AND token = 'p8Vl8+svNkS1XX0mnGr4O48JW0n/0y1GquYjEVxC1zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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