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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb0c67a41aa0bcb0bd9b4e4389b205d02c26e85d051326b164637f5dd573e23' 
  AND token = 'Po1iQA6M8NzO0T/j5bCRL2noXsVT8wyxpoek16CQ+60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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