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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd31952b5935f7ab6d5f78a126d91eb5882093d4117498ae6964f7b0980007e' 
  AND token = 'AFyiZDqTx7m3vPMBglGYlGx7msMAN1TBWXrC8iq2O+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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