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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082bb773ed6b4392cb794b0903e1e598dc508b6e9507d7db7e422f46341c7ad8' 
  AND token = 'pQJsilcrSZ0MKZDPU9dBAQAkvUGbj8iTSO2MH0nqJVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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