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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cccdb64db03951dcc2556c249c14c82d84e04d5054c45c269a20d6c61ec714' 
  AND token = '2dQIWM9b1MG99T8n31A7QioHTi/BI26btqtHvg5ud7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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