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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b0e84a5a63bc9fef6e143d0fc1688bcde7372b58891a8e103b062af21cc9df' 
  AND token = 'ORfDdzri1tTPhC3z2716bIgilOV6klByDV3lLC6g4kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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