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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433ed0a06ba3c098a04a00ef2b5a6fae0d6a2aa91cf04ca6f916c3fc03f3cba6' 
  AND token = 'S4+kDHNCtiYfsuifuRDJFTSu5IJ14aj1krOJvDCZLaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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