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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9933b81ed67cb41d74a8913a4ad977855fd1c7629952757deeb3b18a77e647b0' 
  AND token = 'tCDknNUXBru1YQsLSqc4KoB18tBiWItbA7Li+lNBwbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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