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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd108a0c2151a2379aba2e8eed25fdc0e3bc3d787c0666b6e2b7f15c14ebff95e' 
  AND token = 'Mmiz+oZlS5SRc7bgGEH+CiNZYxp3hPG71iGCBDH5SWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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