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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ecbc047fa2d99c47527cfab484c073cd878072ec2614ab2f3f61bf54719279' 
  AND token = 'kuL+3My32VDrx6XyB1d/YJwe+KfoJkjMMd6xYNlkPFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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