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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adecb2ebf1b56b4d0fd3f3b1ed318e25ba58dce71231a7df04a3f6aa5c6d3b6' 
  AND token = 'DcMOEmUeni9TSrbzdCkoGL814POsG5lgU7uMTWzGRrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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