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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fc1f4533c9081203e6e26c8f7fd227ad8da06f2226359badcc6938cc74d4d7' 
  AND token = 'iNrEeMOll8MidT0PtIkBkhlhqclKFtFph+Tdtt/etP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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