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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fe38403bfe288c3fec15d61995046f63eebeaab189308128237b5700001b43' 
  AND token = '7HRdEVWzpyJm6Dd0++8WyJESc0bZ0/qzijCpdjsT+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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