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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84eb2b92792cce89c7b9a679ff5ff3107a78fc5e9563a710bc02b54bc669ef4e' 
  AND token = '0ECfoPr8ms2y5fi7ZBKGgEEK4oeJjEpbdVZsyl5HK6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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