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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cf03ec4b958f58c384a384fa434831b431a36cc01c57b0c0c299d0eb851039' 
  AND token = 'ObT06YpeAROZSZwg2xCTYsSpdq6T7kZbfR5Po1LibqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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