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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6136816d4cf2f6d5212a53cd118e07239816b3c3c9c0b434d526dc02af20404b' 
  AND token = 'YghtMIdRUsuT9dJKk12FJZCgn11LAHgKWvZkRoWBtfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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