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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcacceb85f8bb116ba61a64bbae908db4ddf8f9b761a762cfd1ebd7433bb877f' 
  AND token = 'a1W1sokYEtZxbW3ZEuq2Yfhp3vW/jDrf2/RhK8144PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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