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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6e9394d8216182b383dfcb6ebb48ae481fdfb0a653cde1ddcf64ba3e62b8d7' 
  AND token = 'uERRPZUcWuimPsEUB60oiOJOhk3mCQvsV6vHlbMiWlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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