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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1156ceb7edc2877a0686bfee5705f510438fabe96494595d02e2dd896a0a1e9b' 
  AND token = 'xHk5X6hpqvs1D7g6A5JPsm4sQTmedyWG8xHp6RAz6cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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