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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6db524be363feadd36e82612b6d5bfde2098269a1b4c9949beb7185e653dee' 
  AND token = 'niF9NDaUE+lBUOckNTDgbcelmrmOU9SW5kA0h6n+vKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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