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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0276523b1c2147d629afdeeb5fa47de9d3735b40f5d94820735e09cd6c106848' 
  AND token = 'uvbhXk3CjOX7IYiCA30AHVMt8WqfkP++tP2pOzydQKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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