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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4813ad23d0c975cae0832eb8729eeb6aabcb3c24f1473c32093ac8e923f34a' 
  AND token = 'GFlTsL44scNhAqljyC54WH1y1NwAVuxKy2tycP9Gv6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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