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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62437c587d5f18ff5601382fc09ee8fb53d463879e56fc678c08a1c0fd91e6b' 
  AND token = 'bddyuCdkAeqQDg0pk2kbDM1f2GcvXknSV13rK22Ql0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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