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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e138c224fe4de01afb44d7e5d1e9bdb8ff61423385e183dd13a463cd8b04d19b' 
  AND token = 'D4V+JQRm43tpHfVG2C/6nlfMJpve1lMtzdU5RlNsXqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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