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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3262890d5be25c6e1885be2f0b7a6ddb67b63e9b09bca6fce77571866beba80e' 
  AND token = 'DcWciLAC6TnPr8s+pcbBJ22SabMI5VIDtHuN90Z51LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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