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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7eec48ee3e0cb8318e3122a999fbed9565d784d7fb53acce26923c29eb682b' 
  AND token = 'ZBC3Wc3916z9Q6AMzRvMM4edLfgm0kdQJGofn3hhmOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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