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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef183db4848d43944244d1b932f221427cea8739a453af9befb0a45ce43e8dea' 
  AND token = 'dCkGkCdC10hF5tn90OSmwI3024muD2gN0zI/GnbNt8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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