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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b85bc9e1b5d00a55bb7948929c33d243f000615dad3565b099bd197286b6d39' 
  AND token = 'ZM0RrhDWrGxtP3Vu2VMzGcp5WdQshaheI55buYjcuDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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