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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2d2a0dff7ad06f9068bb753cdd6b0ebb5573fd055051af3fd338f220f1451f' 
  AND token = 'aptQ2ynIPUlfN8fiQaI8ur2IHYj76ZL2zVa7KSOks6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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