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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2576f2237234d9add4a470cc32f334d7de99787ce1a6269157a6d17ec281f8' 
  AND token = 'mNX4+udLmAU0ZwzKH+evWw9OjVEdabxDVdgI/OcyaX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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