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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bca3990cd3b403d62c062a5d9bb7f3559219f21372382e1d04a90aa8d24d6aa' 
  AND token = 'AbkktNpsKpeEzKhqRgx12vIxM+yVm6sbwnThvmm0kvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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