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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfa95be5d92b865f43d22096b92feff523a210ee6dac7ef7f4ed2c793bd1ae1' 
  AND token = 'o5+GSVrhrSMTPuMRUDdaIN71osa0KALEqkWzRXl7tGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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