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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef024a51c717f1c185284e58e18628cbaf8b2e03ddcbaf815af87809105883e3' 
  AND token = 'sHU2PW4UnAaQdRDbxHfu62aKA1oKVtKHiLP/2GzTnQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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