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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164cd85e248f7020eb1d8f8a4dcf1cfd38c60203fcee5fea41c62a68b7f2a547' 
  AND token = 'TiyIJrnwbY0PLcV5k7njmvdxjja9l6A89DsP1aPXaAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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