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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4318672e5904494cf8c9218b8add3708f1139baa66c4403465ebe48d1be1a5' 
  AND token = '58lLvyL14mvELZO90Ief2/63PiJRJyjfIsB7Ed7kJcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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